Liquid and mechanical seal



June 15,1926. I

R. E. WILSON .LIQUID AND MECHANICAL SEAL Filed March 24, 1924 v five 07.- JZoZeW $219023 Patented June 15, 1926. i v UNITED STATES PATENT OFFICE.

ROBERT n. WILSON, or

or wmrme, nwnmn CHICAGO, ILLINOIS, ASS A, AND cnrcneo, ILLIN IGNOB TO STANDARD OIS, A CORPORATION LIQUID AND MECHANICAL SEAL.

OIL COMPANY, OF INDIANA.

Application filed March 24, 1924. Serial No. 701,810.

The present invention relates to improvements in sealing devices and more particularly to such devices employed in connection with vent pipes from storage tanks contached to the 11 per horizontal portions of two diametrical y opposite strips 16 extends across the top of the.: casing to serve as a limit for the upward movement of thetaining volatile h uids such as gasoline, pecap 17. t troleum and the like. It will be fully un-. The cyl1ndr1cal guide member 9' is proderstood from the following description, vl-ded with large open1ngs 22 below the illustrated by the accompan in which a formof constructi the invention is shown in ver the sin le figure of the draw As s wn in the drawin formed as a substantially-u preferably substantially cyl and having near'its lower end an upwardly directed plpe-connectingportion 6 to which the vent pipe from a storage tank may be connected. An annular bottom member 7 closes'in an annular compartment 8 formed by a cylindrical 'member 9 which projects upwardly from the bottom member 7. Thev cylindrical member 9, which, as hereinafter pointed out, functions in part as a guide member, extends above a transverse annular partition 10, which divides the annular compartment 8 from a similar upper annular compartment 11. A shorter cylindrical guide member 12 extends from the bottom of the device 7 upwardly within the cylindrical guide 9 and spaced a suflicient dis- I tance therefrom to permit the wires movement of the sealing cap 13, which is pro-. vided with a skirt 1 4 extending into the space between the guides 9 and 12. A short distance above the pl Above the transverse partition 10 and outside of the cylindrical guide 9 is provided a guide member consisting of six substan' tially equally placed vert1cal strips 16, 1-6 extending from the partition 10 to the top the guide 9 assist in glvmg freer access of 'ofthe casing where their ends are bent the gas to the cap 17. The cap 17 is fitted/100 outwardly and then down a short distance loosely enough, however, over the guide 9 on the outsideof the casing 5. These six so t at gas can pass'downwar'dly toward strips 16, 16 are spaced a slight distance the lower edge of the cap 17 on the inside from the "cylindrical guide member 9 to perbetween its inner surface and the outside of mit the free movement therebetween of the the guide9. Whenthis cap has been raised 1 p 17 which has a skirt 1,8 freely movable sufl'iciently so that the head of liquid outside between the guide 9 and the guide strips 16 -of the capis not sutlicient to balance the in the same manner as the cap 13 operates pressure of gas, gas escapes under the skirt between the guides 9 and 12.

I 18 of thecap 17 and bubbles up through the A transverse bar 19 having its ends atliquid into the-c ing drawing, on embodying tical section in ing.

g, the device is pright casing 5, lndrical in form tending subst to the bottom 7 of the openings betwe 16, 16 which openi tend 'to the p I A suitable protecting cover 25 is supported bythe casing on the three supporting members 26 which have their lower ends bent outwardly and then downwardly to engage the upper edge of the casing 5 to hold said cover 25 in place.

The guide member 9 above the partition is provided with openings 35 in its upper part and likewise the guide member 12'is provided with openings, 36 in its upper part. In operation, the device is supported so .as to permit free passage of air into it from below, and is connected by means of the connecting pipe portion 6 with a conduit or' pipe leading from the vent of the storage tank, for example, a gasoline storage tank. A'suitable liquid, preferably a non-volatlle oil such as mineral seal oil, is placed in the annular compartments 8 and 11, extending somewhat above the lower ends of the openings 22 and 23, respectively, in the two compartments. hen, by reason of increasing on temperature, pressure is generated in the tank and in the connections with the conduit leading from the tank to the casing, this pressure is communicated through the openings 22 in the cylindrical guide member 9 95 to the interior of the latter-and tends to raise the cap 17, the lower end of which is immersed in liquid. The openings 35, 35 in 85 en the vertical members ngs it will be noted exartition 10.

' the cap 13 tirmly seated on the guide 12.

\Vhen. by reason of atmospheric or other "causes, there is a diminished pressure in the system, in excess of a predetermined amount, the partial vacuum created tends to pull the cap 17 firmly down on its seat on the upper endof the guide 9. Air then tends to be drawn up through the opening in the bottom of the casing, raising the cap 13 until its lower end is sufficiently raised in the liquid so that the head of liquid out side of it will not balance the air pressure from within whereupon air escapes around the lower edge of said cap 13 bubbling up through the liquid into the compartment 8 thereby relieving the vacuum in the system.

The openings 36 in the upper end of the cylindrical member 12 give freer access of entering air to the cap 13. This cap, however, is loosely enough fitted on the guide 12 so that air can pass downwardly between its interior surface and the outer surface of said guide 12.

In the form of construction illustrated, it will be seen that the entire interior of the device is readily accessible from above. The cover 25 may be easily removed by lifting it off. The bar 19 may then be easily removed by detaching its ends from the two strips 16. After removal of the bar 19, the cap 17 may be lifted out by simply sliding it up inside of the guide strips 16 and out at the top. The bar 15 may then be easily removed from the guide member 9 by taking out the cap screws 37, 37 which hold its ends. After the removal of the bar 15 the cap 13 may be lifted out by merely sliding it up inside of the guide 9 and lifting it out at the top of the casing. The device may hence be readily inspected and cleaned. It is to be particularly noted that the guide 9 is of a uniform internal diameter throughout its entire length and that the guide strips 16, 16 likewise form a guide member having a uniform diameter which diameter is greater than the internal diameter of the guide member 9. When the cover, and the cross strips 19 and 15 are removed,'the cap 17 may easily be lifted out through the top of the'casing and then likewise the cap 13.

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes, therefore. in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as possible in view of the prior art.

I claim:

1. In a pressure and vacuum relieving seal, a casing with a bottom and having a transverse partition above said bottom, a cylindrical guide member extending from the bottom of the casing upwardly through said partition, a sealing cap slidable within the guide member and opening through the bottom ofthc casing to the exterior thereof, a second sealing member above the partition and surrounding the cylindrical guide member, said sealing member being open to the space in the casing below the partition, means for making an external pipe connection with the interior of the casing below the partition, and means for retaining a liquid in said casing on its bottom and on said transverse partition.

2.1n apressure and vacuum relieving seal, a casing having a central opening at its bottom, a central transverse partition in said casing provided with a central opening, a,

guide member surrounding the central opening in the bottom of the casing and extending through the opening in said partition, said guide member being provided with openings below the plane of said partition, a short guide member within the iirst-mentioned guide member, a sealing cap normally resting upon said shorter guide member and slidable between it and the first-mentioned guide member, a sealing cap normally resting upon the first-mentioned guide member above the central transverse partition, a guide for said cap spaced exteriorly of the said guide member, said exterior guide being provided with openings and guide members forming annular compartments in said casing above and below the transverse partition, a lateral opening into the lower of said compartments for connection to a gas-containing system, the casing being provided with a central opening above the upper cap.

In a pressure and vacuum relieving seal; a casing having an opening at the top and the bottom, and having a transverse partition with an opening therethrough; means for making an external pipe connection with the interior of the casing below the partition; means for retaining a liquid in sa1d casing on its bottom and on said transverse partition; an inlet sealing cap below the partition having its interior communicating with the openlng in the bottom of the casing to the exterior thereof; a vertical guide for said cap, said guide extending upwardly through said partition, an outlet sealmg cap above the partition slidable on said guide and having its interior communicatmg with the opening in said partition to the space in the casing below said partition; both of said caps being removable through ion the opening in the top of the casing without disturbing said guide.

4. In a pressure and vacuunr relieving.

seal; a casing having an openingat the top and the bottom, and provided with a transverse partition having an opening therethrough; means for making an external pipe connection with the interior of the casing below said partition; an outlet sealing cap over the opening in the partition having its open end sealed in'a body ofliquid on said partition; a vertical guide for said ca said ing said guide. g

Q. In a. pressure and vacuum relievmg guide extending downwardly througi said partition, an inlet sealing cap over the opening in the bottom of the casing slidable on said guide and having its open end sealed in a body of liquid on said bottom; both of said caps being removable through the opening in the top of the casing without disturbseal; a casing having an opening at the top and the bottom, and provided w1th a transverse partition having an opening there through; means for making an external pipe connection with the interior of the casing t upwardly out of the guide and through the opening in the top of the casing without disturbing said guide.-

. ROBERT E. WILSQN. 

